SELECT * FROM question_mgmt as q WHERE id=3626 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=256 and ex_no='4' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science Periodic Classification of Element compare and contrast the arrangement of elements i

Question:

Compare and contrast the arrangement of elements in Mendeléev’s Periodic Table and the Modern Periodic Table.

Answer:

Mendeleev’s
periodic table

Modern
periodic table
 1. Elements are arranged in the increasing order of their atomic masses. 1. Elements are arranged in the increasing order of their atomic numbers.
 2. There are a total of 7 groups (columns) and 6 periods (rows). 2. There are a total of 18 groups (columns) and 7 periods (rows).
 3. Elements having similar properties were placed directly under one another.  3. Elements having the same valence shell are present in the same period while elements having the same number of valence electrons are present in the same group.
 4. The position of hydrogen could not be explained.  4. Hydrogen is placed above alkali metals.
 5. No distinguishing positions for metals and non-metals.  5. Metals are present at the left hand side of the periodic table whereas non-metals are present at the right hand side.

 


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